Practice

Names to Structural Formulas

Try your hand at working out the structural formulas for these compounds. (They are also shown in exercise 21 in your workbook.) Check your formulas with the answers shown below before you continue.

1,4-dibromo-2,3-dimethylbutane

3,4-diethyl-2,2,6-trimethylheptane

Structural Formulas to Names

Now try your hand at naming the compounds whose structural formulas are shown here. (these are also shown in exercise 22 in your workbook.

Answers

In the structural formulas below, the orientations of the added groups can be different from what is shown as long as the added groups are attached to the proper carbon atoms in the chain.

1,4-dibromo-2,3-dimethylbutane
3,4-diethyl-2,2,6-trimethylheptane

The name of this compound is dichlorodifluoromethane. You do not need to include "1's" on this, but you can. The only reason you do not need to include "1's" is because there is only one carbon atom to which these fluoro and chloro groups can be attached.

The common name for this compound is Freon-12. Where that came from, I really do not know, but it is an easier name to work with than dichlorodifluoromethane.

The name of this compound is 4,7-dichloro-5-ethyl-2,2-dimethyloctane. (Remember the "tie-breaker" rule - click here and look at #2 -count the chain in the direction that gives you the smallest numbers overall for your side groups.)

Hopefully, this has given you enough practice using the IUPAC method to name alkyl halides and to derive the structures of alkyl halides from the names. If you do want more practice later on, you can work with the examples in the text or get some practice problems from the instructor.

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